In general, 2 hours postprandial blood sugar 6.5mmol/L is normal, but for some special groups of people, it may be a little bit low. 1. General population: normal people have fasting blood sugar value 3.9-6.1mmol/L, and 2 hours postprandial blood sugar is less than 7.8mmol/L. For people who do not have diabetes, 2 hours postprandial blood sugar 6.5mmol/L means At present, the blood sugar metabolism is normal; 2. Diabetic patients: If a diabetic patient, after diet, exercise or medication, the 2-hour blood sugar after meal is 6.5mmol/L, which proves that the patient has normal blood sugar control; 3. Pregnant women: For pregnant women, the normal 1-hour blood sugar after meal does not exceed 10.0mmol/L during pregnancy, and the 2-hour blood sugar after meal cannot exceed 8.5 mmol/L, the postprandial blood sugar of 6.5mmol/L for pregnant women is normal; 4. Special groups: for people who are old, such as people over 70 years old, or people with many complications, such as cardiovascular and cerebrovascular complications, patients with cerebral thrombosis, cerebral hemorrhage or diabetic nephropathy after myocardial infarction bypass surgery or stent surgery, the postprandial blood sugar of 6.5mmol/L is low, and 8-9mmol/L is appropriate. 9mmol/L is appropriate. Because these patients usually have high blood sugar, hypoglycemia may occur when the blood sugar is closer to normal.